[FIX] tab4: cap heatmap percentages at 100%, show percentages instead of exact values in chart data table

tabs/tab4_optimization.py

@@ -675,7 +675,7 @@ def show_heatmap(df_result, resource_caps, method_costs, custom_resources=None,
                 used = resource_usage.get(r, {}).get(method, 0.0)
             else:
                 used = normalized_costs.get(method, {}).get(r, 0.0) * df_result.at[method, f"{CO2_UNIT} removed"]
-            row_pct.append(used / cap * 100)
+            row_pct.append(min(used / cap * 100, 100.0))
             row_exact.append(used)
         matrix_pct.append(row_pct)
         matrix_exact.append(row_exact)
@@ -718,7 +718,11 @@ def show_heatmap(df_result, resource_caps, method_costs, custom_resources=None,
     )
 
     with st.expander("📊 View / download chart data"):
-        st.dataframe(df_export_exact, width='stretch', hide_index=True)
+        df_pct_display = df_export_pct.copy()
+        for col in df_pct_display.columns:
+            if col != "Method":
+                df_pct_display[col] = df_pct_display[col].map(lambda x: f"{x:.1f}%")
+        st.dataframe(df_pct_display, width='stretch', hide_index=True)
 
     register_chart_data("Resource usage heatmap (% of cap)", df_export_pct)
     register_chart_data("Resource usage exact values", df_export_exact)